JP2006201639A - Zoom unit for camera and camera - Google Patents

Zoom unit for camera and camera Download PDF

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Publication number
JP2006201639A
JP2006201639A JP2005014920A JP2005014920A JP2006201639A JP 2006201639 A JP2006201639 A JP 2006201639A JP 2005014920 A JP2005014920 A JP 2005014920A JP 2005014920 A JP2005014920 A JP 2005014920A JP 2006201639 A JP2006201639 A JP 2006201639A
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Prior art keywords
lens
lens group
magnification
camera
liquid crystal
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Japanese (ja)
Inventor
Yasuaki Kayanuma
安昭 萱沼
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Citizen Electronics Co Ltd
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Citizen Electronics Co Ltd
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Priority to JP2005014920A priority Critical patent/JP2006201639A/en
Priority to GB0600859A priority patent/GB2422441B/en
Priority to TW095101935A priority patent/TW200643463A/en
Priority to US11/338,432 priority patent/US20060164540A1/en
Priority to KR1020060006823A priority patent/KR20060085586A/en
Priority to DE102006003136A priority patent/DE102006003136A1/en
Priority to FR0600652A priority patent/FR2881231A1/en
Priority to CNA2006100599846A priority patent/CN1818737A/en
Publication of JP2006201639A publication Critical patent/JP2006201639A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/22—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances
    • G02B15/24—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/12—Fluid-filled or evacuated lenses
    • G02B3/14—Fluid-filled or evacuated lenses of variable focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lens Barrels (AREA)
  • Lenses (AREA)
  • Liquid Crystal (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that it is difficult to miniaturize a zoom camera and that the cost becomes high because a zoom unit requires at least two actuators. <P>SOLUTION: The zoom unit for a camera is equipped with a lens group for varying power and a lens group for adjusting a focal position, which are simultaneously moved by one actuator. By providing a liquid crystal lens or a liquid lens, a focal position is finely adjusted by the liquid crystal lens or the liquid lens. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、カメラモジュール及びカメラに関し、特にズーム機能を持つカメラモジュールの小型化技術に関する。
The present invention relates to a camera module and a camera, and more particularly to a technology for downsizing a camera module having a zoom function.

カメラのズームを行うには倍率を変えるレンズ群と焦点を調節するためのレンズ群の最低２つのレンズ群を動かさなければならない。
また通常、無限遠を撮影する場合と近距離を撮影する場合では焦点の位置が異なるため、倍率変更用レンズ群と焦点調整用レンズ群とを独立に動かす必要がある。 To zoom the camera, it is necessary to move at least two lens groups: a lens group for changing the magnification and a lens group for adjusting the focal point.
Further, since the focal point position is usually different when photographing at infinity and when photographing a short distance, it is necessary to move the magnification changing lens group and the focus adjusting lens group independently.

図３は被写体への距離とレンズ群の位置を説明する図である。
図３（ａ）はズーム倍率２倍で被写体が無限遠にある時、図３（ｂ）はズーム倍率が同じく２倍で被写体が３０ｃｍの距離にある時の、固定レンズ群１０，倍率変動用レンズ群１２，焦点位置を調整する合焦用レンズ群１４と受光ＩＣ１６との位置関係を示している。なお１８は筐体を示している。
図３（ａ）、（ｂ）に示すように、同じ倍率でも焦点位置を受光ＩＣ１６の受光部に合わせるには、被写体の位置によって合焦用レンズの位置をａからｂに移動させる必要がある。
なお以下の図において、同様の部材には同様の番号を付している。 FIG. 3 is a diagram for explaining the distance to the subject and the position of the lens group.
FIG. 3A shows the fixed lens group 10 for changing the magnification when the zoom magnification is double and the subject is at infinity, and FIG. 3B is the same zoom magnification and the subject is at a distance of 30 cm. The positional relationship between the lens group 12, the focusing lens group 14 for adjusting the focal position, and the light receiving IC 16 is shown. Reference numeral 18 denotes a housing.
As shown in FIGS. 3A and 3B, in order to adjust the focal position to the light receiving unit of the light receiving IC 16 even at the same magnification, it is necessary to move the position of the focusing lens from a to b depending on the position of the subject. .
In the following drawings, the same members are denoted by the same numbers.

図４は倍率を変えた時の各レンズ群の位置を示した図である。
図４において、２２は倍率を１倍、２倍、３倍としたときの固定レンズ群１０の位置、２４は倍率変動用レンズ群１２の位置、２６，２８は合焦用レンズ群１４の位置を示したものである。倍率を変えた時倍率変動用レンズ群１２の位置はレンズ位置２４に示すように一義的に決まるが、焦点を受光ＩＣ１６の受光部の位置２０に合わせるためには合焦用レンズ群１４の位置は被写体までの距離によって変動してしまう。例えば被写体が無限遠にある場合は合焦用レンズ群１４は２８に示した位置を取る必要があるし、被写体が１０ｃｍの距離にある場合は合焦用レンズ群１４は２６に示した位置を取る必要がある。
この結果ズーム機能を持つズームユニットとしては、倍率を変えるレンズ群の位置を動かすアクチュエーターと焦点位置を調節するレンズ群の位置を動かすアクチュエーターとの２つのアクチュエーターが必要であった。 FIG. 4 is a diagram showing the position of each lens group when the magnification is changed.
In FIG. 4, 22 is the position of the fixed lens group 10 when the magnification is 1 ×, 2 ×, and 3 ×, 24 is the position of the magnification varying lens group 12, and 26 and 28 are the positions of the focusing lens group 14. Is shown. When the magnification is changed, the position of the lens group 12 for changing the magnification is uniquely determined as shown by the lens position 24, but the position of the focusing lens group 14 is in order to focus on the position 20 of the light receiving unit of the light receiving IC 16. Varies depending on the distance to the subject. For example, when the subject is at infinity, the focusing lens group 14 needs to take the position shown in 28, and when the subject is at a distance of 10 cm, the focusing lens group 14 takes the position shown in 26. I need to take it.
As a result, a zoom unit having a zoom function requires two actuators: an actuator that moves the position of the lens group that changes the magnification and an actuator that moves the position of the lens group that adjusts the focal position.

図５は従来のズームユニットを示す概略図である。
図５において、固定レンズ群１０，倍率変動用レンズ群１２，合焦用レンズ群１４と受光ＩＣ１６とがレンズ鏡筒１８の光軸Ｌ上に置かれており、倍率変動用レンズ群１２を固定している部材３０が第１のアクチュエータ３４によって、合焦用レンズ群１４を固定している部材３２が第２のアクチュエータ３６によって動かされ、ズームユニットとしての機能を果たしていた。 FIG. 5 is a schematic view showing a conventional zoom unit.
In FIG. 5, the fixed lens group 10, the magnification changing lens group 12, the focusing lens group 14 and the light receiving IC 16 are placed on the optical axis L of the lens barrel 18, and the magnification changing lens group 12 is fixed. The member 30 holding the focusing lens group 14 is moved by the first actuator 34, and the member 32 fixing the focusing lens group 14 is moved by the second actuator 36, thereby functioning as a zoom unit.

アクチュエーターに関しては、高速に焦点を合わせる目的で２つのアクチュエーターを使うという提案がある。
この内容は、粗調用の第１のアクチュエーターと、微調用の第２のアクチュエーターと、合焦状態を判定する合焦状態判定手段とを備え、前記合焦状態判定手段にて被合焦部材が合焦位置を通過した事を判定されるまでの期間、前記合焦位置の方向へ前記第１のアクチュエーターによる駆動により前記被合焦部材を素早く移動させ、合焦位置を通過した事が判定されることにより前記第１のアクチュエーターによる駆動を停止すると共に該第１のアクチュエーターによる駆動方向とは逆方向へ、前記第２のアクチュエーターによる駆動により、前記被合焦部材をゆっくり移動させ、その後は前記合焦状態判定手段の出力に基づいて前記第２のアクチュエーターの駆動方向とその駆動終了を決定するというものである（例えば特許文献１参照）。 Regarding actuators, there is a proposal to use two actuators for the purpose of focusing at high speed.
This content includes a first actuator for coarse adjustment, a second actuator for fine adjustment, and a focus state determination means for determining a focus state, and the in-focus member is determined by the focus state determination means. During the period until it is determined that the in-focus position has been passed, the in-focus member is quickly moved in the direction of the in-focus position by driving the first actuator, and it is determined that the in-focus position has been passed. In this way, the drive by the first actuator is stopped and the in-focus member is slowly moved by the drive by the second actuator in the direction opposite to the drive direction by the first actuator. The driving direction of the second actuator and the driving end thereof are determined based on the output of the in-focus state determining means (see, for example, Patent Document 1).

この提案には合焦レンズ用のアクチュエーターに関する記載しかないが、ズーム機能のためには倍率変動用レンズ群の為のアクチュエーターも必要であり、とすると少なくとも３つのアクチュエーターを必要とすることになってしまう。
少なくとも３つのアクチュエーターを使うことになればズームユニットの大型化は避けられずかつコストが大幅に上昇してしまうという問題があった。 This proposal only describes the actuator for the focusing lens, but for the zoom function, an actuator for the lens unit for changing the magnification is also required, and at least three actuators are required. End up.
If at least three actuators are used, the enlargement of the zoom unit is inevitable, and the cost increases significantly.

また、ビューファインダー系と撮像系のピント合わせレンズ群を共通の１つのアクチュエーターで移動させ、ビューファインダー系と撮像系の倍率調整用レンズ群を共通の１つのアクチュエーターで移動させるという提案もある（例えば特許文献２参照）。
この提案によればビューファインダー系と撮像系の双方を有するカメラにとってはアクチュエーターを減らすことが出来有益であるが、ズームユニットの小型化という観点から見るとビューファインダー系と撮像系の２つのレンズ群を設けることは考えられず、異なる分野の問題である。
また、この提案にもあるようにアクチュエーターの数は減少させたいが、ピント合わせ用と倍率調整用には別々のアクチュエーターが必要というのが従来の技術であった。 In addition, there is a proposal that the focusing lens group of the viewfinder system and the imaging system is moved by a single common actuator, and the magnification adjustment lens group of the viewfinder system and the imaging system is moved by a single common actuator (for example, Patent Document 2).
According to this proposal, a camera having both a viewfinder system and an imaging system is beneficial because it can reduce the number of actuators, but from the viewpoint of miniaturization of the zoom unit, the two lens groups of the viewfinder system and the imaging system are useful. It is unthinkable to have a problem in a different field.
In addition, as suggested in this proposal, it is desired to reduce the number of actuators, but it has been a conventional technique that separate actuators are necessary for focusing and adjusting magnification.

このようにズームユニットはアクチュエーターを少なくとも２つ必要とするため、ズームカメラの小型化が難しく、コストも高くなってしまうという問題があった。
またアクチュエーターは精密な動き、位置関係が要求されるため組み立て性が問題となっていた。 As described above, since the zoom unit requires at least two actuators, there is a problem that it is difficult to reduce the size of the zoom camera and the cost is increased.
In addition, since the actuator requires precise movement and positional relationship, assemblability has been a problem.

一方近来注目すべき技術が開発されている。
それは液晶レンズ、液体レンズと呼ばれるもので、平板状基板同士を対向配設してなる液晶セルを利用し、これにレンズ機能をもたせた液晶レンズが提案されている（例えば特許文献３参照）。
また、焦点距離を高速で調節可能な、入射光の透過率の高い回折型液晶レンズ及び多焦点回折型液晶レンズが提案されている（例えば特許文献４参照）。
さらに、ロイヤル フィリップスエレクトロニクス社からは２００４／３／３付けで小型で焦点距離の変更が可能な液体レンズが発表されている。
本発明はこの焦点距離を高速で調節可能な液晶レンズもしくは液体レンズを利用してズームユニットの小型化を計ろうとするものである。 On the other hand, notable technologies have been developed recently.
This is called a liquid crystal lens or a liquid lens, and a liquid crystal lens using a liquid crystal cell in which flat substrates are arranged to face each other and having a lens function has been proposed (for example, see Patent Document 3).
In addition, a diffractive liquid crystal lens and a multifocal diffractive liquid crystal lens, which can adjust the focal length at high speed and have high transmittance of incident light, have been proposed (see, for example, Patent Document 4).
Furthermore, Royal Philips Electronics has announced a liquid lens that can be changed in focal length with a compact size of 2004/3/3.
The present invention intends to reduce the size of the zoom unit by using a liquid crystal lens or a liquid lens capable of adjusting the focal length at high speed.

特開２００３−２４１０７４JP2003-241074 特開平６−３００９５８JP-A-6-300958 特開平６−１３０３５１JP-A-6-130351 特開平２００２−３５７８０４ ＮＨＫJP 2002-357804 NHK

解決しようとする問題点は、ズームユニットにはアクチュエーターを少なくとも２つ必要とするため、ズームカメラの小型化が難しく、コストも高くなってしまったという点である。
そこで本発明の目的は小型で安価なズームユニット及びカメラを実現することである。
The problem to be solved is that the zoom unit requires at least two actuators, which makes it difficult to reduce the size of the zoom camera and increases the cost.
Therefore, an object of the present invention is to realize a small and inexpensive zoom unit and camera.

本発明のカメラ用ズームユニットは、倍率を変えるレンズ群と焦点位置調整用のレンズ群とを備え、１つのアクチュエーターで該倍率を変えるレンズ群と該焦点位置調整用のレンズ群を同時に動かすと共に、液晶レンズもしくは液体レンズを設け、焦点位置を該液晶レンズもしくは液体レンズで微調整することを特徴とする。   The zoom unit for a camera of the present invention includes a lens group for changing the magnification and a lens group for adjusting the focal position, and simultaneously moving the lens group for changing the magnification and the lens group for adjusting the focal position with one actuator, A liquid crystal lens or a liquid lens is provided, and the focal position is finely adjusted by the liquid crystal lens or the liquid lens.

また、本発明のカメラは、上記ズームユニットを備えたことを特徴とする。
A camera according to the present invention includes the zoom unit.

１つのアクチュエーターでカメラ用ズームユニット作成することが可能となり、小型化、安価化、組み立て性の改善が可能となった。
It became possible to create a zoom unit for a camera with a single actuator, making it possible to reduce the size, reduce the cost, and improve the assembly.

カメラ用ズームユニットにおいて、倍率を変えるレンズ群と焦点位置調整用のレンズ群とを備え、１つのアクチュエーターで該倍率を変えるレンズ群と該焦点位置調整用のレンズ群を同時に動かすと共に、液晶レンズもしくは液体レンズを設け、焦点位置を該液晶レンズもしくは液体レンズで微調整した。
The zoom unit for a camera includes a lens group for changing the magnification and a lens group for adjusting the focal position, and simultaneously moving the lens group changing the magnification and the lens group for adjusting the focal position with one actuator, A liquid lens was provided, and the focal position was finely adjusted with the liquid crystal lens or the liquid lens.

図１は本発明による各レンズ群の位置を倍率毎に示した図である。
図１においては固定レンズ群１０、倍率変動用レンズ群１２、合焦用レンズ群１４に加へ、固定レンズ群１０の前方に液晶レンズもしくは液体レンズ４０を設けている。なおこの液晶レンズもしくは液体レンズ４０を置く位置は固定レンズ群１０の前方に限定されるものではなく各レンズ群１０，１２，１４の中間、受光部の位置２０の前面等いろいろな選択肢がある。
図１において、５２は倍率を１倍、２倍、３倍としたときの固定レンズ群１０の位置、５４は倍率変動用レンズ群１２の位置を示したもので、これらは図４の関係とほぼ同一である。
５０は液晶レンズもしくは液体レンズ４０の位置、５６は合焦用レンズ群１４の位置を示したもので、本発明においては倍率を変えた時も液晶レンズもしくは液体レンズ４０の位置は一定とし、合焦用レンズ群１４の位置は一義的に決めている。合焦用レンズ群１４の位置を一義的に決めた場合は被写体との距離によって焦点を結ぶ位置が若干異なってしまう。本発明のズームユニットにおいてはこの若干の位置の差を合焦用レンズ群１４を駆動させることなく、液晶レンズもしくは液体レンズを使用して焦点位置をＩＣの受光面に合わせている。 FIG. 1 shows the position of each lens group according to the present invention for each magnification.
In FIG. 1, a liquid crystal lens or a liquid lens 40 is provided in front of the fixed lens group 10 in addition to the fixed lens group 10, the magnification changing lens group 12, and the focusing lens group 14. The position where the liquid crystal lens or the liquid lens 40 is placed is not limited to the front of the fixed lens group 10, and there are various options such as the middle of the lens groups 10, 12, and 14, the front surface of the light receiving unit position 20.
In FIG. 1, 52 indicates the position of the fixed lens group 10 when the magnification is set to 1 ×, 2 ×, and 3 ×, and 54 indicates the position of the lens group 12 for changing the magnification. Almost identical.
50 indicates the position of the liquid crystal lens or liquid lens 40, and 56 indicates the position of the focusing lens group 14. In the present invention, the position of the liquid crystal lens or liquid lens 40 is constant even when the magnification is changed. The position of the focusing lens group 14 is uniquely determined. When the position of the focusing lens group 14 is uniquely determined, the focal point position is slightly different depending on the distance to the subject. In the zoom unit of the present invention, the focus position is adjusted to the light receiving surface of the IC by using a liquid crystal lens or a liquid lens without driving the focusing lens group 14 due to this slight difference in position.

液晶レンズもしくは液体レンズが調整できる焦点位置の範囲は比較的小さい。しかし各倍率で、接写から無限遠までの焦点位置調整を行うくらいの調整は可能である。
そこで、大まかな焦点位置まで合焦用用レンズ群を利用して焦点位置を合わせ、微調整のみを液晶レンズで行う。その際に、倍率変動用レンズ群と合焦用群は１つのアクチュエーターで一定の比率を保つことにより、倍率を変えながら大まかな焦点位置を合わせつつ変化させる。このように一定の比率を保つことはカムを利用して行う。該比率はレンズの特性によって異なるが、カムによって該比率を保つことは従来技術で実現可能である。 The range of the focal position where the liquid crystal lens or liquid lens can be adjusted is relatively small. However, it is possible to adjust the focal position from close-up to infinity at each magnification.
Therefore, the focus position is adjusted using the focusing lens group to a rough focus position, and only fine adjustment is performed with the liquid crystal lens. At that time, the magnification changing lens group and the focusing group are changed while maintaining a fixed ratio by one actuator, while adjusting a rough focus position while changing the magnification. The constant ratio is maintained using a cam. The ratio varies depending on the characteristics of the lens, but it is possible to realize the ratio by a cam in the prior art.

図２は本発明によるズームユニットを示す概略図である。
図２において、液晶レンズもしくは液体レンズ４０，固定レンズ群１０，倍率変動用レンズ群１２，合焦用レンズ群１４と受光ＩＣ１６とがレンズ鏡筒１８の光軸Ｌ上に置かれている。倍率変動用レンズ群１２を固定している部材４３と合焦用レンズ群１４を固定している部材４２はカム機構４５によって位置関係が一定の比率に保たれた状態で１つのアクチュエータ４４によって、倍率を変えながら大まかな焦点位置を合わせつつ、動かされる。この状態では１つの距離の被写体にしか焦点位置があっていないため液晶レンズもしくは液体レンズ駆動部４６が液晶レンズもしくは液体レンズ４０を高速に制御して焦点位置の微調整を行い、ズームユニットとしての機能を果たしている。
なお、受光ＩＣ１６、液晶レンズもしくは液体レンズ駆動部４６を鏡筒内に設けるか鏡筒の外部に設けるかは設計上の問題である。 FIG. 2 is a schematic view showing a zoom unit according to the present invention.
In FIG. 2, a liquid crystal lens or liquid lens 40, a fixed lens group 10, a magnification changing lens group 12, a focusing lens group 14, and a light receiving IC 16 are placed on the optical axis L of the lens barrel 18. The member 43 fixing the magnification variation lens group 12 and the member 42 fixing the focusing lens group 14 are maintained by the cam mechanism 45 in a state where the positional relationship is maintained at a constant ratio by one actuator 44. It is moved while adjusting the rough focus position while changing the magnification. In this state, since the focus position is only on the subject at one distance, the liquid crystal lens or liquid lens driving unit 46 performs high-speed adjustment of the liquid crystal lens or liquid lens 40 to finely adjust the focus position, so that the zoom unit functions as a zoom unit. Plays a function.
Whether the light receiving IC 16, the liquid crystal lens or the liquid lens driving unit 46 is provided inside the lens barrel or outside the lens barrel is a design problem.

以上説明したように本発明のカメラ用ズームユニットにおいては、液晶レンズもしくは液体レンズを用いることにより、従来のズームユニットが２つ必要としていたアクチュエーターを１つに削減するという顕著な効果を生じている。
アクチュエーター１つでズームユニットが構成可能となったため、ズームユニットの小型化、安価化、さらには組み立て性の改善が可能となった。
また、上記ズームユニットを用いたカメラも小型化、安価化が可能となった。
As described above, in the camera zoom unit according to the present invention, the use of a liquid crystal lens or a liquid lens has a remarkable effect of reducing the number of actuators required by two conventional zoom units to one. .
Since the zoom unit can be configured with a single actuator, the zoom unit can be made smaller, less expensive, and more easily assembled.
In addition, the camera using the zoom unit can also be reduced in size and cost.

本発明による各レンズ群の位置を倍率毎に示した図である。It is the figure which showed the position of each lens group by this invention for every magnification. 本発明によるズームユニットを示す概略図である。It is the schematic which shows the zoom unit by this invention. 被写体への距離とレンズ群の位置を説明する図である。It is a figure explaining the distance to a to-be-photographed object, and the position of a lens group. 倍率を変えた時の各レンズ群の位置を示した図である。It is the figure which showed the position of each lens group when changing magnification. 従来のズームユニットを示す概略図である。It is the schematic which shows the conventional zoom unit.

符号の説明Explanation of symbols

１０ 固定レンズ群
１２ 倍率変動用レンズ群
１４ 焦点位置調整用（合焦用）のレンズ群
４４ アクチュエーター
４０ 液晶レンズもしくは液体レンズ
DESCRIPTION OF SYMBOLS 10 Fixed lens group 12 Magnification variation lens group 14 Lens group 44 for focus position adjustment (focusing) Actuator 40 Liquid crystal lens or liquid lens

Claims (2)

カメラ用ズームユニットにおいて、
倍率を変えるレンズ群と焦点位置調整用のレンズ群とを備え、１つのアクチュエーターで該倍率を変えるレンズ群と該焦点位置調整用のレンズ群を同時に動かすと共に、
液晶レンズもしくは液体レンズを設け、焦点位置を該液晶レンズもしくは液体レンズで微調整することを特徴とするカメラ用ズームユニット。 In the camera zoom unit,
A lens group for changing the magnification and a lens group for adjusting the focal position, and simultaneously moving the lens group for changing the magnification and the lens group for adjusting the focal position with one actuator;
A zoom unit for a camera, comprising a liquid crystal lens or a liquid lens and finely adjusting a focal position with the liquid crystal lens or the liquid lens. 請求項１記載のズームユニットを備えたカメラ。
A camera comprising the zoom unit according to claim 1.
JP2005014920A 2005-01-24 2005-01-24 Zoom unit for camera and camera Pending JP2006201639A (en)

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JP2005014920A JP2006201639A (en) 2005-01-24 2005-01-24 Zoom unit for camera and camera
GB0600859A GB2422441B (en) 2005-01-24 2006-01-17 Zoom lens systems and camera having the same
TW095101935A TW200643463A (en) 2005-01-24 2006-01-18 Zoom lens system and camera having the same
US11/338,432 US20060164540A1 (en) 2005-01-24 2006-01-23 Zoom lens system and camera having the same
KR1020060006823A KR20060085586A (en) 2005-01-24 2006-01-23 Zoom lens system and camera having the same
DE102006003136A DE102006003136A1 (en) 2005-01-24 2006-01-23 Zoom lens system and camera with selbigem
FR0600652A FR2881231A1 (en) 2005-01-24 2006-01-24 ZOOM LENS SYSTEM AND PHOTOGRAPHIC APPARATUS HAVING SUCH A ZOOM LENS SYSTEM
CNA2006100599846A CN1818737A (en) 2005-01-24 2006-01-24 Zoom lens system and camera having the same

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